/*
 * @(#)Syslogd.java	1.0 Mar 8, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.net.syslog;

import static org.eoti.net.PortMap.WellKnownPort.syslog;

import java.util.concurrent.*;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.net.DatagramPacket;

public class Syslogd
extends Thread
{
	protected CopyOnWriteArrayList<SyslogListener> listeners;
	protected DatagramSocket socket;
	protected byte[] buf = new byte[1024];
	protected boolean started = false;
	protected boolean done = false;

	public Syslogd()
	throws SocketException
	{
		super("Syslogd");
		listeners = new CopyOnWriteArrayList<SyslogListener>();
		socket = new DatagramSocket(syslog.getConfig().getPort());
	}

	public void addSyslogListener(SyslogListener listener)
	{
		listeners.add(listener);
		if(!started)
		{
			started = true;
			this.start();
		}
	}
	public void removeSyslogListener(SyslogListener listener){listeners.remove(listener);}

	public void kill(){done = true;}

	public void run()
	{
		while(!done)
		{
			try{
				DatagramPacket packet = new DatagramPacket(buf, buf.length);
				socket.receive(packet);
				SyslogEvent event = new SyslogEvent(packet);
				for(SyslogListener listener : listeners)
					listener.messageReceived(event);
			} catch(Exception e){
				System.err.format("%s\n", e.getMessage());
				e.printStackTrace();
			}
		}
	}

	protected void finalize()
	throws Throwable
	{
		socket.close();
		super.finalize();
	}
}
